Warren h



'.(No Model.) A y WL H. TAYLOR.

PLATE KEY EUR LoKs. 1 No. 263,244. Patented Aug. 22;l 1882i IJNITEDSTATES PATENTV OFFICE.

WARREN H. TAYLOR, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE LOCKMANUFACTURING COMPANY, OF SAME PLACE.

PLATE-KEY FOR LOCKS.

SPECIIEICATION forming part of LettersPatentiNo. 263,244, dated August22, 1882.

Application tiled June 22, 1882. (No model.)

` To all whom it may concern Beit known that I, WARREN H. TAYLOR, ofStamford, in the county of VFairtield and State of Connecticut, have'invented a certain new and useful improvement in flat or plate keys forlocks having rotary hubs or roll-backs, and also in such hubs, of whichthe following is a specitication.

With the ordinary flat key there is always more or less difficultyoccasioned by the tilting of the key when in place in the hub, caused,for example, by the pressure of the hand or the weight of a bunch ofkeys on a ring with the at key. This tilting throws the keyout ofregister or adjustment with respect `to the tumblers, so that sometimesthe hub will not turn, or will not turn smoothly. This difficulty hasbeen overcome with respect to plate-keys by theinvention ot corrugatedplate-keys, and

by providing corresponding sinuous slots or key-holes in the lock-hubs;but thatinvention, although effective and excellent, and also attendedwith advantages with respect to prevventin g lock-picking, is not sosimple-and easy to manufacture as would be desirable. Hence I havedevised my key and a corresponding hub, with the same object ofpreventing tilting when in place in the lock, and with specialreferenceto thesimplicityand cheapness of manu` facture of the key andlock-hub. Accordingly I provide a ange or projection upon one side, orit may be upon both sides of the straight edge of my key-blade,extending out at a right angle a suitable distance, andofsuitablelength, and I also lf rovide"alockhub with a key-slotcorresponding in cross-section with the sectional outline ot' thekey-blade.

In the accompanying drawings, illustrating my invention, Figure 1 is alongitudinal vertical section of a lock; Fig. 2, a transverse sectionofthe same on the line 2 2 of Fig. 1; Fig. 3, a side elevation of mykey, and Fig. 4a section of the same on the line 4t 4c of Fig. 3.

A indicates the key-blade, and B the Iiange or projection at one side otits straight edge and flush therewith; C, the hub; D, the main keyslottherein, and E the side recess for the side flange of the key.

It is obvious that the flange B, when within the side recess, E, of thekey-slot, will prevent the key from tilting. The advantages of havingthe ange B at one side of the straight edge of the key are, rst, thatitcan be cheaply and conveniently produced by stamping from a steel platewithout causing a corresponding depression on the opposite side of theblade, as would be necessary if the rib were located along the middle ofthe blade, and it serves materially to strengthen the blade 5. second,the key-slot to accommodate the key can readily be formed in the hub byplaning out both -the main slot and the side groove or key-flangerecess.

The key-Han ge may be ot' any desirable shape in cross-section suitableto the purpose of the ange. i

I am aware that projections from the sides of the bits of cast keys havebeen made, and that corresponding key-holes have also been made; butmyinvention relates to a dierent species of locks .and a special classof keys, and is designed to be, and practically is, a clear improvementupon the class of locks and keys to which it appertains. I disclaimcorrugated plate-keys and side-ribbed bits of cast keys, and thecorresponding key-recesses of such keys. Ialso disclaim aplate-key withside ribs, such as shown in the patent of J. Brady, No. 103,837,patented June 7, 1870.

1. An improved plate-key, having the blade A, provided with a flange, B,laterally projecting from its straight edge and flush therewith,

substantially as and for the purpose set forth.

